Ford Truck Parts. Below are the diagrams F100 Central has available. To save them to your desktop, right click with your mouse and choose Save Link As. NOTE : The links are to PDF files that can be up to 400 megabytes in file size.. The 1977 Ford Truck Wiring Diagrams (100-800 Series) is a complete and comprehensive collection of wiring diagrams, schematics, and electrical illustrations. Covers all Ford truck models in the 100-800 series to include models such as: Bronco, Econoline, B500, E100/300, F100/350, B600/700 Cowl, F600-700 Cowl, B600-800 Cab, F600-800 Cab!.